/Engine/Source/Runtime/GeometryCore/Public/CompGeom/ConvexHull2.h
Divide-and-conquer algorithm
void GetHull ( [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< [TVector2](API\Runtime\Core\Math\TVector2)< RealType >(int32)> GetPointFunc, [TArray](API\Runtime\Core\Containers\TArray)< int32 > & Merged, int32 & IdxFirst, int32 & IdxLast )